Electric heating element



Get, 25 W49 T. W. @LYNN ET AL 2,436,148

ELECTRIC HEATING" ELEHENT Filed Eflarch 19,, 1846 lNvENToRS THEQDORE. WaLuAMGLYuu ATTQRE Patented Oct. 25, 1949 ELECTRIC HEATING ELEMENT Theodore William Glynn and Charles Richard Venable, Kingsport, Tcnn., assignors to Blue Ridge Glass Corporation, Kingsport, Team, a

corporation of New York Application March 19, 1946, Serial No. 655,619

1 Claim.

This invention relates to a heating element embodying a glass plate having deposited thereon a conducting metal grid in which the several bars of the grid are so proportioned that the ends thereof adjacent to one edge of the plate are 01 higher resistance per unit length than those ad- J'acent to the opposite edge, so that the generation of heat by the grid is asymmetrical.

The accompanying drawings, in which corresponding marks are designated by corresponding marks of reference, .is a plan view of a glass panel, or plate, having a conducting grid deposited thereon in accordance with this invention.

The plate, or panel, A has deposited thereon a conducting grid B or metal which may be deposited electrically, chemically, or, as is preferred, by a thermal gun. Each bar of the grid is each connected at one end to the corresponding end 01' an adjacent bar, and one end of each of the external bars is connected when in use to one end or an electric teed circuit. To provide for I the asymmetrical heating before referred to, we

so construct the bars that each of them has greater resistance per unit length on one side or the medial line of the panel, or sheet, than on the other. In the instant case this is accomplished by making the breadth of the bars greater at the bottom of the sheet than at the top.

As the space between the several bars is of uniform width from end to end, this results in on the other.

THEODORE WILLIAM GLYNN. CHARLES RICHARD VENABLE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,881,444 Flanzer Oct. 11, 1982 2,119,680 Long June 7, 1938 FOREIGN PATENTS Number Country Date 406,634 Great Britain May 21, 1932 841,327 France Feb. 1, 1939 

